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 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.protocols.ss7.cap.api.service.circuitSwitchedCall;

/**
 *
 *<p>
 * The activity test (AT) is used for testing the CAMEL dialogue between the gsmSCF and the
 * gsmSSF. The SCP may send CAP AT at regular intervals to the gsmSSF, e.g. every 15 min. The
 * only function of CAP AT is to verify the existence of the CAMEL dialogue. When the gsmSSF
 * receives CAP AT, it returns an empty RESULT to the gsmSCF. If the gsmSCF does not receive an
 * operation RESULT within the operation time for CAP AT, e.g. 5 s, then the gsmSCF terminates the
 * CAMEL service. CAP AT is normally sent by the SCP platform, not by the CAMEL service. The
 * arrival of CAP AT in the gsmSSF has no impact on any call handling process or on the BCSM.
 * The sending of CAP AT is not dependent on the phase of the call or on the gsmSSF FSM state.
 *
 *</p>
 * activityTest OPERATION ::= { 
 *  RETURN RESULT TRUE 
 *  CODE   opcode-activityTest} 
 * -- Direction: gsmSCF -> gsmSSF, Timer: T  
 * at
 * -- This operation is used to check for the continued existence of a relationship 
 * -- between the gsmSCF and gsmSSF, assist gsmSSF or gsmSRF. If the relationship is 
 * -- still in existence, then the gsmSSF will respond. If no reply is received, 
 * -- then the gsmSCF will assume that the gsmSSF, assist gsmSSF or gsmSRF has failed 
 * -- in some way. 
 *
 *
 * 
 * @author sergey vetyutnev
 * 
 */
public interface ActivityTestRequest extends CircuitSwitchedCallMessage {

}
